Describe the bug
When attempting to install an arbitrary package, using an instance of vcpkg built with gcc-6.3, the install will fail after post-built validation. The error is No such file or directory while trying to remove the x64-linux.zip artifact.

This bug has been observed in Ubuntu 20.04 LTS, and in CI using the debian-stretch-slim image.

Environment

• OS: Ubuntu 20.04 LTS, and in CI using the debian-stretch-slim image
• Compiler: GCC 6.3

To Reproduce
Steps to reproduce the behavior:
(install and set gcc-6)

1. echo "deb http://old-releases.ubuntu.com/ubuntu zesty main" | sudo tee /etc/apt/sources.list.d/zesty.list
2. sudo apt update
3. sudo apt install g++-6
4. export CC=gcc-6 CXX=g++-6
5. ./vcpkg/bootstrap-vcpkg.sh
6. ./vcpkg/vcpkg install gtest

Expected behavior
Expected packages to install successfully.

Failure logs
The following is the content of a vcpkg-manifest-install.log, but the bug and output is the same when running any install.

Detecting compiler hash for triplet x64-linux...
The following packages will be built and installed:
fmt[core]:x64-linux -> 8.0.1
gtest[core]:x64-linux -> 1.11.0
* vcpkg-cmake[core]:x64-linux -> 2021-09-13
* vcpkg-cmake-config[core]:x64-linux -> 2021-09-27
Additional packages (*) will be modified to complete this operation.
Restored 1 packages from /home/parallels/.cache/vcpkg/archives in 64.69 ms. Use --debug to see more details.
Starting package 1/4: vcpkg-cmake-config:x64-linux
Building package vcpkg-cmake-config[core]:x64-linux...
-- Installing: /home/parallels/sandbox/vcpkg-gcc6/source/vcpkg/packages/vcpkg-cmake-config_x64-linux/share/vcpkg-cmake-config/vcpkg_cmake_config_fixup.cmake
-- Installing: /home/parallels/sandbox/vcpkg-gcc6/source/vcpkg/packages/vcpkg-cmake-config_x64-linux/share/vcpkg-cmake-config/vcpkg-port-config.cmake
-- Installing: /home/parallels/sandbox/vcpkg-gcc6/source/vcpkg/packages/vcpkg-cmake-config_x64-linux/share/vcpkg-cmake-config/copyright
-- Performing post-build validation
-- Performing post-build validation done
remove(/home/parallels/sandbox/vcpkg-gcc6/source/vcpkg/buildtrees/vcpkg-cmake-config/x64-linux.zip): No such file or directory